Figure 4.

Process of 3D printing of tissue models. A, A scapula is imaged with non–contrast material–enhanced CT. B, The scapula (yellow) is then segmented from the CT image. C, A surface enclosing the segmented voxels—that is, the Standard Tessellation Language (STL) model—is created. D, The STL model is typically postprocessed—for example, to trim unnecessary portions and add identifiers (arrow). E, The designed model is then printed by using a 3D printer. F, Theprinted model is cleaned to remove support structures, such as the scaffold (arrows in E) generated by the stereolithography printer in this example.